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# DoubleUnaryOperator

`public interface DoubleUnaryOperator`
``

java.util.function.DoubleUnaryOperator

Represents an operation on a single `double`-valued operand that produces a `double`-valued result. This is the primitive type specialization of `UnaryOperator` for `double`.

This is a functional interface whose functional method is `applyAsDouble(double)`.

See also:

- `UnaryOperator`

## Summary

### Public methods
`default DoubleUnaryOperator` | `andThen(DoubleUnaryOperator after)` Returns a composed operator that first applies this operator to its input, and then applies the `after` operator to the result.
`abstract double` | `applyAsDouble(double operand)` Applies this operator to the given operand.
`default DoubleUnaryOperator` | `compose(DoubleUnaryOperator before)` Returns a composed operator that first applies the `before` operator to its input, and then applies this operator to the result.
`static DoubleUnaryOperator` | `identity()` Returns a unary operator that always returns its input argument.

## Public methods

### andThen

    public DoubleUnaryOperator andThen (DoubleUnaryOperator after)

Returns a composed operator that first applies this operator to its input, and then applies the `after` operator to the result. If evaluation of either operator throws an exception, it is relayed to the caller of the composed operator.

Parameters
`after` | `DoubleUnaryOperator`: the operator to apply after this operator is applied

Returns
`DoubleUnaryOperator` | a composed operator that first applies this operator and then applies the `after` operator

Throws
`NullPointerException` | if after is null

See also:

- `compose(DoubleUnaryOperator)`

### applyAsDouble

    public abstract double applyAsDouble (double operand)

Applies this operator to the given operand.

Parameters
`operand` | `double`: the operand

Returns
`double` | the operator result

### compose

    public DoubleUnaryOperator compose (DoubleUnaryOperator before)

Returns a composed operator that first applies the `before` operator to its input, and then applies this operator to the result. If evaluation of either operator throws an exception, it is relayed to the caller of the composed operator.

Parameters
`before` | `DoubleUnaryOperator`: the operator to apply before this operator is applied

Returns
`DoubleUnaryOperator` | a composed operator that first applies the `before` operator and then applies this operator

Throws
`NullPointerException` | if before is null

See also:

- `andThen(DoubleUnaryOperator)`

### identity

    public static DoubleUnaryOperator identity ()

Returns a unary operator that always returns its input argument.

Returns
`DoubleUnaryOperator` | a unary operator that always returns its input argument

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